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Cho, Hyungjoon
Biomedical Imaging Science and Engineering Lab(BISE)
Research Interests
  • Imaging tumor microenvironments, susceptibility contrast based MR structural imaging, ultra fast acquisitions of dynamic MR, algorithm/Hardware development for magnetic particle imaging

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Multispin dynamics of the solid-state NMR free induction decay

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Title
Multispin dynamics of the solid-state NMR free induction decay
Author
Cho, HyungjoonLadd, TDBaugh, JCory, DGRamanathan, C
Keywords
MULTIPLE-QUANTUM NMR; SYSTEMS; RELAXATION; SPACE; SPINS
Issue Date
2005-08
Publisher
AMERICAN PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.72, no.5, pp.054427 -
Abstract
We present a new experimental investigation of the NMR free induction decay (FID) in a lattice of spin- 1/2 nuclei in a strong Zeeman field. Following a π/2 pulse, evolution under the secular dipolar Hamiltonian preserves the coherence number in the Zeeman eigenbasis, but changes the number of correlated spins in the state. The observed signal is seen to decay as single-spin, single-quantum coherences evolve into multiple-spin coherences under the action of the dipolar Hamiltonian. In order to probe the multiple-spin dynamics during the FID, we measured the growth of coherence orders in a basis other than the usual Zeeman eigenbasis. This measurement provides the first direct experimental observation of the growth of coherent multiple-spin correlations during the FID. Experiments were performed with a cubic lattice of spins (F19 in calcium fluoride) and a linear spin chain (F19 in fluorapatite). It is seen that the geometrical arrangement of the spins plays a significant role in the development of higher-order correlations. The results are discussed in light of existing theoretical models.
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DOI
10.1103/PhysRevB.72.054427
ISSN
2469-9950
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BME_Journal Papers
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